NorthStar MX500 Operator's & Installation Manual page 115

GPS
ID number and the columns represent the 1's digit of the ID number.
The satellite system consists of up to 32 ID numbers. The ID num-
bers are called PseudoRandom Numbers.
To find a particular satellite ID, for example PRN 24, go down the
left hand column and locate the 10's digit (2- in this case). Then go
across the row until you intersect with the appropriate 1's digit (in
this case 4).
The bottom window provides some basic satellite tracking perfor-
mance information. The HDOP and VDOP values indicate the cur-
rent Horizontal or Vertical Dilution Of Precision.
The Used Sats value indicates the number of satellites used in the
navigation filter to calculate your position
The Elevation Mask sets the lowest elevation at which a satellite will
be tracked. Satellites with an elevation below this number will not be
tracked, even if they are otherwise available to track.
Unhealthy Satellites
Satellites are expected to fail at some point in time and they may
cause the position calculation to become erroneous.
enabled units, you will be able to determine which satellite PRN num-
ber is causing the position error. The operator can then decide to
manually force the offending satellite to "unhealthy". A satellite that
is marked as unhealthy will not be used for position calculation.
To mark a satellite as unhealthy, do the following;
1. Press the EDIT key.
2. Use the UP/DOWN arrows to move the cursor to the PRN num-
ber.
3. Highlight the "Force Unhealthy" softkey and press the ENT key.
4. Press the EDIT key to exit.
Version 3.0
The "H" mark for healthy will become "-" for unhealty.
Operator's Manual
With RAIM
101